{"product_id":"icp-defrost-control-board-for-yj042g2-heat-pump-24v-ships-today-1","title":"ICP Defrost Control Board for YJ042G2 — Heat Pump 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM defrost control board (Part No. 34332101) for the ICP \/ Tempstar \/ Heil YJ042G2 heat pump. The defrost board is the brain of the outdoor unit's heating cycle — it monitors the coil temperature sensor and the defrost timer, then commands the reversing valve, condenser fan, and auxiliary heat to clear frost and ice from the outdoor coil during heat-pump operation. Operating on a 24V control signal, it sequences the components so the system defrosts efficiently and returns to heating without nuisance trips. When this board fails, the outdoor coil ices over and heating efficiency collapses, the unit may run constantly in defrost, the reversing valve may not switch, or the system may stop responding to the thermostat entirely.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e34332101\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eDefrost Control Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP \/ Tempstar \/ Heil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump Defrost Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for the ICP YJ042G2 heat pump and used across the ICP brand family — Tempstar, Heil, Comfortmaker, and Arcoaire heat pumps calling for defrost board 34332101. Verify the printed part number on your existing board before ordering, as defrost boards are model-specific.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage at the board with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser electrical\/service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and the defrost sensor\/jumper pin positions before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the wire harnesses and coil sensor, then remove the mounting screws\/standoffs holding the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, set the defrost timer jumper to match the original, and reconnect every harness per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, initiate a heating call, and confirm the board commands a normal defrost cycle and returns to heating.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutdoor coil freezes over and heating output drops.\u003c\/li\u003e\n\u003cli\u003eUnit stuck in continuous defrost or never defrosts at all.\u003c\/li\u003e\n\u003cli\u003eReversing valve fails to switch between heat and cool.\u003c\/li\u003e\n\u003cli\u003eNo response from the outdoor unit on a thermostat call.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003eShips same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"OEM","offer_id":63027189842291,"sku":"34332101","price":168.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047504789875,"sku":"34332101-GEN","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-34332101_7c559e5d-9bce-471b-8a55-e5bae42e3843.jpg?v=1782887185","url":"https:\/\/nationalhvacparts.com\/products\/icp-defrost-control-board-for-yj042g2-heat-pump-24v-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}